Effect of surface roughness heights on circular cylinder wakes

Research output: Chapter in Book/Conference paperConference paperpeer-review

1 Citation (Scopus)

Abstract

Marine growth (MG) refers to the colonisation of aquatic life on the underwater surface of artificial structures. The existence of MG alters the surface conditions of structures and influences their hydrodynamic properties. In the present study, the MG was mimicked by using the 3D printed hemispherical roughness. Four different roughness heights, namely, 5%, 10%, 15%, and 20% times the diameter of the bare cylinder, were selected and the tests were conducted in a water flume using particle image velocimetry (PIV). It was found that with the increase of roughness height, the Strouhal number decreases and the boundary layers on both sides of the cylinder become thicker and move outwards. The results also indicate that the surface roughness disturbs the shear layers on both sides of the cylinder which then influences the vortex shedding frequency and the wake formation length.
Original languageEnglish
Title of host publicationProceedings of the 22nd Australasian Fluid Mechanics Conference AFMC2020
EditorsHubert Chanson, Richard Brown
Place of PublicationBrisbane
PublisherUniversity of Queensland
Number of pages4
ISBN (Electronic)9781742723419
DOIs
Publication statusPublished - 2020
Event 22nd Australasian Fluid Mechanics Conference - Brisbane, Australia
Duration: 7 Dec 202010 Dec 2020

Publication series

Name22nd Australasian Fluid Mechanics Conference, AFMC 2020

Conference

Conference 22nd Australasian Fluid Mechanics Conference
Abbreviated titleAFMC2020
Country/TerritoryAustralia
CityBrisbane
Period7/12/2010/12/20

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